noun
green maple leaves; maple before turning red
Refers to fresh green maple leaves in spring and summer, or the tree itself before autumn coloring. A seasonal word (kigo) for early summer.
青紅葉が美しい季節になりました。
It's the season when the green maple leaves are beautiful.
寺の庭には青紅葉が茂っている。
Green maple trees are growing thickly in the temple garden.
noun
kasane color combination (green front, russet back)
A traditional layered color scheme used in Heian-era court clothing, where the outer layer is green and the inner layer is russet, evoking maple leaves before they turn red. Specialized historical term.
See also: 襲
青紅葉の襲は、表が青、裏が赤みがかった色合いです。
The aomomiji kasane has a green front and a reddish back.
襲 is the general term for layered color combinations in traditional court dress; 青紅葉 is one specific named combination.
Compound of 青 (ao, 'green') and 紅葉 (momiji, 'maple leaves' or 'autumn colors'). The reading あおもみじ follows standard rendaku voicing.